Disable Output Buffering (#3220)

To ensure await asyncio prints [Processing: %s]' every 30s as expected
open-navigation · Sep 23, 2022 · 80909a1 · 80909a1
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diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -447,6 +447,7 @@ _environments:
     RCUTILS_LOGGING_BUFFERED_STREAM: "0"
     RCUTILS_LOGGING_USE_STDOUT: "0"
     DEBIAN_FRONTEND: "noninteractive"
+    PYTHONUNBUFFERED: "1"
 
 executors:
   release_exec:

diff --git a/Dockerfile b/Dockerfile
@@ -43,6 +43,7 @@ RUN echo '\
 APT::Install-Recommends "0";\n\
 APT::Install-Suggests "0";\n\
 ' > /etc/apt/apt.conf.d/01norecommend
+ENV PYTHONUNBUFFERED 1
 
 # install CI dependencies
 ARG RTI_NC_LICENSE_ACCEPTED=yes